Free tools
Calculators and checkers for founders
Small tools for the numbers founders check every week: runway, payment fees, unit economics, Domain Rating. Free, no signup, and the calculators run in your browser.
Money and metrics
Runway calculatorMonths of cash left, the date it runs out, when to raise, and whether you are default alive.Open toolPayment fee calculatorWhat Stripe, Paddle, Lemon Squeezy and Polar take from each sale, side by side.Open toolLTV:CAC calculatorCustomer lifetime value, LTV to CAC ratio and the months it takes to earn back a customer.Open tool
SEO and backlinks
Launch
Questions about the tools
- Are these startup tools really free?
- Yes. Every tool here is free, with no account and no email gate. The calculators are free to run because they run in your browser; the Domain Rating checker and the DR badge generator ask for a quick human check to keep bots out.
- Do you store the numbers I type into the calculators?
- No. The runway, payment fee and LTV:CAC calculators run entirely in your browser and send nothing to our servers. A share link puts your numbers in the URL, so only the people you send it to see them.
- Which calculator should a pre-seed founder start with?
- The runway calculator. It tells you how many months of cash you have, when to start raising, and whether your growth gets you to profit first. Once you have paying customers, the LTV:CAC calculator shows whether each customer is worth what you pay to win them.
- Where do the Domain Rating numbers come from?
- From Ahrefs. The Domain Rating checker reads the live figure from the free Ahrefs Domain Rating API.
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